CN111688473A - Electric automobile water pump control method and system - Google Patents
Electric automobile water pump control method and system Download PDFInfo
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- CN111688473A CN111688473A CN202010548377.6A CN202010548377A CN111688473A CN 111688473 A CN111688473 A CN 111688473A CN 202010548377 A CN202010548377 A CN 202010548377A CN 111688473 A CN111688473 A CN 111688473A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/20—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by changing the driving speed
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/007—Testing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
- B60K2001/005—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric storage means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
- B60K2001/006—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric motors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a method and a system for controlling a water pump of an electric automobile, wherein the method specifically comprises the following steps: when the whole vehicle is in an ON/START/CHARGE mode, determining the duty ratio of a control signal for driving a water pump based ON the highest temperature value of a cooling part of a circulating water circuit; when the whole vehicle is in the AfterRun mode, the working duration of the AfterRun mode and the duty ratio of the water pump control signal under each working duration are determined based on the duty ratio of the control signal at the moment of entering the AfterRun mode. According to the difference of power supply modes, the water pump is divided into a normal mode and an AfterRun mode for control, so that the economy and the safety are greatly improved.
Description
Technical Field
The invention belongs to the technical field of electric automobiles, and particularly relates to a method and a system for controlling a water pump of an electric automobile.
Background
The cooling water pump control is to control the cooling water pump to work according to the temperature of each component in the cooling circulation water channel, and the flow of the cooling water pump is adjusted by changing the duty ratio of the control signal, so that the temperature of the cooling component is maintained in a normal range.
The traditional method for controlling the cooling water pump of the automobile is too single, the running states of the automobile are not distinguished, and the safety and the economical efficiency of the running of the automobile are reduced. If the automobile is stopped, the traditional control method is to control the cooling water pump or close the cooling water pump according to the normal running condition of the automobile, and then the automobile is naturally cooled; in addition, the conventional method for controlling the cooling water pump of the automobile does not consider the influence of the external temperature on the heat dissipation capacity of the automobile.
Disclosure of Invention
The invention provides a control method of an electric automobile water pump, and aims to solve the problems.
The invention is realized in such a way that a method for controlling a water pump of an electric automobile specifically comprises the following steps:
when the whole vehicle is in an ON/START/CHARGE mode, determining the duty ratio of a control signal of a corresponding water pump based ON the highest temperature value of a cooling part of a circulating water path;
when the whole vehicle is in the AfterRun mode, the working duration of the AfterRun mode and the duty ratio of the water pump control signal under each working duration are determined based on the duty ratio of the water pump control signal at the moment of entering the AfterRun mode, and the AfterRun mode is an OFF mode or an ACC mode.
Further, when the water pump works in a high-temperature environment, the duty ratio of a control signal of the water pump is compensated positively, namely, the duty ratio of the control signal for driving the water pump is increased, and when the water pump works in a low-temperature environment, the duty ratio of the control signal of the water pump is compensated negatively, namely, the duty ratio of the control signal of the water pump is reduced.
Further, the method for calculating the rotating speed of the water pump based on the duty ratio of the control signal is as follows:
wherein v ismaxFor maximum speed of water pump, PWMtDuty ratio, PWM, of control signal for water pump at present1Is the control signal duty ratio, PWM, when the water pump is closed2Is the control signal duty ratio when the water pump is fully opened.
Further, the water pump fault diagnosis method specifically comprises the following steps:
reporting a low-voltage fault when the fault feedback duty ratio signal is 10%;
the fault feedback duty ratio signal is 20%, and a current fault is reported;
reporting an idle fault when the fault feedback duty ratio signal is 30 percent;
and (5) reporting the overvoltage fault when the fault feedback duty ratio signal is 80%.
Further, the starting conditions of the water pump are as follows:
condition 1: the whole vehicle is in an ON/START/CHARGE mode, and the water pump is enabled to be set to be 1;
or the whole vehicle is in the AfterRun mode.
Condition 2: the voltage of the low-voltage battery meets the normal working voltage of the water pump;
condition 3: the water pump has no fault.
Further, when the highest temperature value of the cooling part of the circulating water path is greater than or equal to the starting threshold temperature, the enabling position of the water pump is '1';
and if the highest temperature of the circulating water path part is less than the closing threshold temperature, the enabling position of the circulating water pump is '0'.
Further, when the whole vehicle is in the AfterRun mode, the control method of the duty ratio of the water pump control signal for each working time in the AfterRun mode is specifically as follows:
determining the working time of the water pump in the AfterRun mode based on the duty ratio of a water pump control signal at the beginning time of the AfterRun;
dividing the working time by the set simulation step length time to obtain the cycle calculation times;
calculating the difference value between the duty ratio of the control signal entering the AfterRun and the duty ratio of the control signal when the water pump is closed;
the quotient of the difference and the cycle calculation times is the duty ratio of the control signal which is required to reduce each simulation step length time in the AfterRun mode;
and (4) gradually subtracting the control signal vacuum ratio from the control signal duty ratio of the water pump at the beginning of the AfterRun, and circulating until the control signal duty ratio is reduced to the control signal duty ratio when the water pump is closed, so that the water pump completely stops working.
The invention is realized in this way, an electric automobile water pump control system, the system includes:
a rear-drive water pump 1 and a rear-drive water pump 2 which are arranged on the rear-drive cooling circulation water path, the rear-drive water pump 1 and the rear-drive water pump 2 are connected with a PWM control signal pin 1 of a VCU controller,
the forerunner water pump 3 is arranged on the forerunner cooling circulation water path, and the forerunner water pump 2 is connected with a PWM control signal pin 2 of the VCU controller;
the VCU controller controls the rear-drive water pump 1, the rear-drive water pump 2 and the front-drive water pump 3 based on the electric automobile water pump control method.
The control method of the automobile water pump provided by the invention has the following beneficial technical effects:
1) the VCU controller controls the water pumps 1, the water pumps 2 perform cooling and heat dissipation for the rear-drive circulating water path system, and the water pumps 3 perform cooling and heat dissipation for the front-drive circulating water path system, so that potential safety hazards caused by faults of a certain cooling water pump are avoided; 2) the fault detection processing of each important part of the cooling circulating water path is added, so that the abnormal processing of the VCU controller caused by the transmission of abnormal signals when the sensor is in fault is avoided; 3) judging the fault type of the water pump according to the duty ratio signal fed back by each water pump controller and reasonably controlling the fault type of the water pump, and abandoning the disadvantages of the traditional look-up table; 4) according to different power supply modes, the water pump is divided into a normal mode and an AfterRun mode for control, so that the economy and the safety are greatly improved; 5) taking into account the influence of the external ambient temperature. At normal temperature (20 ℃), the duty ratio of the water pump can be adjusted according to the temperature of vehicle parts, so that the flow of cooling liquid of the cooling loop is adjusted. At high temperature (above 40 ℃), the temperature difference between the parts and the environment is small, and the heat dissipation is more difficult. A certain duty ratio needs to be added on the basis of the duty ratio corresponding to the temperature of the parts so as to enhance the heat dissipation capability. At low temperature (such as below-20 ℃), a certain duty ratio needs to be subtracted from the duty ratio corresponding to the temperature of the parts, and the rotating speed of the water pump needs to be properly reduced so as to avoid excessive cooling. The economy and the safety are greatly improved; 6) according to the duty ratio signal of the cooling water pump, a set of brand-new rotating speed calculation model is designed, the disadvantages of the traditional look-up table type are abandoned, and the processing speed of the VCU controller is greatly improved.
Drawings
FIG. 1 is a flow chart of a method for controlling a water pump of an electric vehicle according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a water pump control system of an electric vehicle according to an embodiment of the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be given in order to provide those skilled in the art with a more complete, accurate and thorough understanding of the inventive concept and technical solutions of the present invention.
Fig. 1 is a flowchart of a method for controlling a water pump of an electric vehicle according to an embodiment of the present invention, and the following description is made with reference to fig. 1 for controlling the water pump of the electric vehicle:
a cooling water pump control module (PTMR) controls the operation of a cooling water pump according to the temperature of each component in the cooling circulation water channel, and adjusts the flow rate of the water pump by changing the duty ratio of a control signal so as to maintain the temperature of the cooling component in a normal range, wherein the cooling component comprises: charger, motor inverter and DCDC.
Q＝2πnrA
Wherein r is the distance from the center of the water pump to the water outlet of the water pump (approximately, the movement of the cooling liquid in the cooling water pump is considered as circular movement), and n is the rotating speed of the water pump; a is the cross section area of a water outlet pipe at a water outlet of the water pump; q is the water pump flow, r and A are the definite values, and the vehicle adopts electric water pump, adjusts the water pump rotational speed through the duty cycle that changes control signal, and the water pump flow also changes thereupon.
The control method adopted by the invention is as follows: the VCU controller controls the water pump 1, the water pump 2 and the water pump 3.
The water pump 1 and the water pump 2 provide cooling water circulation power for a rear drive circulation water path such as a rear drive motor (RMCUMtrA), a rear drive motor inverter (RMCUMtrInvA), a charger and a DCDC, and the two water pumps share one PWM control signal pin. The VCU sends PWM control signals to the water pump 1 and the water pump 2 to be consistent, and meanwhile, the VCU has fault feedback PWM signals corresponding to the PWM control signals, if one of the PWM control signals is in fault, the normal PWM control signals are required to work. The water pump 1 and the water pump 2 share the same set of control logic, and corresponding control parameters are the same.
The water pump 3 supplies cooling water circulation power to a front drive circulation water passage formed by an ISG motor (ISGMtrB), an ISG motor inverter (ISGMtrInvB), a front drive motor (FMCUMtrC), a front drive motor inverter (FMCUMtrInvC), and the like. The water pump 3 is similar to the water pump 1, 2 control logic, but uses another set of control parameters.
Maximum temperature of rear-drive cooling circulation water path part
The rear-drive cooling circulating water path comprises a rear-drive motor (RMCUMtrA), a rear-drive motor inverter (RMCUMtrInvA), a charger, a DCDC and the like. And when the signal of the temperature sensor has no fault, the input value from the IPTR is taken, when the information of the temperature sensor has a fault, the default value is taken as 20 ℃, and the maximum value is the highest temperature of the back-drive circulating water path component.
And the original input signal processing module IPTR is arranged on the VCU controller, is connected with the CAN hard wire, receives temperature values sent by all cooling components in the rear-drive cooling circulating water path, and stores the received temperature values after format conversion.
Highest temperature of water path part of front-drive cooling circulation
The front-drive cooling circulation water path includes an ISG motor (ISGMtrB), an ISG motor inverter (ISGMtrInvB), a front-drive motor (FMCUMtrC), a front-drive motor inverter (FMCUMtrInvC), and the like. When the temperature sensor has no fault, the input value from the IPTR is obtained; and when the information of the temperature sensor fails, the default value is 20 ℃, and the maximum value is the highest temperature of the precursor circulating water path part.
Fault diagnosis of cooling water pump 1
And (3) according to the fault feedback duty ratio signal of the water pump 1 controller, meeting one of the following conditions, namely the fault position is '1', and otherwise, the fault position is '0'.
1) A fault feedback duty ratio signal of the controller of the water pump 1 is equal to 10%, and a low-voltage fault is reported;
2) the fault feedback duty ratio signal of the controller of the water pump 1 is 20 percent, and the current fault is reported;
3) the fault feedback duty ratio signal of the controller of the water pump 1 is equal to 30 percent, and an idle fault is reported;
4) and (4) reporting the overvoltage fault when the fault feedback duty ratio signal of the water pump 1 controller is 80%.
Cooling water pump 2 fault diagnosis
And (3) according to the fault feedback duty ratio signal of the water pump 2 controller, meeting one of the following conditions, namely the fault position is '1', and otherwise, the fault position is '0'.
1) The fault feedback duty ratio signal of the water pump 2 controller is 10%, and low voltage fault is reported;
2) the fault feedback duty ratio signal of the water pump 2 controller is 20%, and the current fault is reported;
3) the fault feedback duty ratio signal of the water pump 2 controller is equal to 30%, and an idle fault is reported;
4) and (4) reporting the overvoltage fault when the fault feedback duty ratio signal of the water pump 2 controller is 80%.
Rear drive circulating water pump enable
Two cooling water pumps in the back-driving circulating water, wherein the water pump 1 and the water pump 2 share the same enable signal.
If the highest temperature of the rear-drive circulating water path part is greater than or equal to the opening threshold temperature of the rear-drive circulating water pump, the enabling position of the rear-drive circulating water pump is '1';
and if the highest temperature of the rear-drive circulating water path part is less than or equal to the closing threshold temperature of the rear-drive circulating water pump, enabling the rear-drive circulating water pump to be at the enabling position of 0.
Control of rear-drive circulating water pump
Conditions that the work of the rear-drive circulating water pump must meet
And after the conditions 1, 2 and 3 are simultaneously met, calculating the control duty ratio of the water pump according to the highest temperature of the rear-drive circulating water path part.
Condition 1: the whole vehicle is in an ON/START/CHARGE mode, and the water pump is enabled to be set to be 1;
or the whole vehicle is in the AfterRun mode.
Condition 2: the voltage of the low-voltage battery meets the normal working voltage of the water pump;
condition 3: the water pump has no fault.
If the requirement is met, the control of the rear-drive circulating water pump is set to be 1, otherwise, the control of the rear-drive circulating water pump is set to be 0 "
Normal mode (Whole vehicle power-ON mode is ON/START/CHARGE)
When the power-ON mode of the whole vehicle is ON/START/CHARGE and the control of the rear-drive circulating water pump is set to be 1, the duty ratio 1 of the control signal of the rear-drive cooling water pump is obtained by looking up a table according to the highest temperature of the rear-drive circulating water path part and is shown in table 1
TABLE 1 correspondence between the duty cycle of the back-drive circulating water pump and the maximum temperature of the back-drive circulating water path part
Afterrun mode (Whole vehicle power-ON mode is changed from ON/START/CHARGR to OFF/ACC)
After run mode, the desired goal is: firstly, the water pump can work for a period of time; the rotating speed of the water pump is gradually reduced to zero; and the duty ratio of the control signal is gradually reduced.
The method is realized by the following steps:
looking up a table according to the highest temperature of a rear-drive circulating water path component at the previous moment when the water pump enters the AfterRun to obtain the starting duty ratio of the water pump at the beginning moment of the AfterRun;
secondly, looking up a table according to the duty ratio 1 of the control signal of the rear-drive cooling water pump at the beginning moment of the AfterRun, and determining the total working time of the water pump in the AfterRun mode, which is shown in a table 2;
dividing the time by the system step length to obtain the cycle calculation times, wherein the quotient of the difference value between the duty ratio when the water pump enters the AfterRun and the duty ratio (10%) when the water pump stops working and the cycle calculation times is the duty ratio of each simulation step length time to be reduced when the AfterRun is started;
and fourthly, gradually subtracting the duty ratio from the start duty ratio of the water pump at the beginning of the AfterRun, and circulating the steps until the duty ratio is reduced to 10% of the default value when the water pump is closed, and completely stopping the water pump.
Control signal duty ratio 2 for rear-drive cooling water pump in AfterRun mode
TABLE 2 correspondence between the operating time of the rear-drive circulation AfterRun water pump and the water pump turn-on duty ratio when entering the AfterRun
Influence of ambient temperature on cooling water pump
The water pump control should take into account the influence of the ambient temperature. At normal temperature (20 ℃), the duty ratio of the water pump can be adjusted according to the temperature of vehicle parts, so that the flow of cooling liquid of the cooling loop is adjusted.
At high temperature (above 40 ℃), the temperature difference between the parts and the environment is small, and the heat dissipation is more difficult. A certain duty ratio needs to be added on the basis of the duty ratio corresponding to the temperature of the parts so as to enhance the heat dissipation capability.
At low temperature (such as below-20 ℃), a certain duty ratio needs to be subtracted from the duty ratio corresponding to the temperature of the parts, and the rotating speed of the water pump needs to be properly reduced so as to avoid excessive cooling.
And on the basis of the calculated duty ratio 1 (or 2) of the control signal of the rear-drive cooling water pump, outputting a final target PWM signal requested by the rear-drive cooling water pump at a duty ratio value compensation value determined based on the external temperature, wherein the control parameters of the water pump 1 and the water pump 2 are the same, but the output interface signals need to be processed respectively).
TABLE 3 Compensation of ambient temperature to Water Pump control Duty ratio
Water pump control signal frequency (hardware standard)
The control signal frequency of the water pump 1 is the same as that of the water pump 2, and the control signal frequency is a fixed value of 200Hz when the water pump is started or closed
Rotating speed of water pump
The corresponding relation between the water pump rotating speed and the target PWM signal requested by the rear-drive cooling water pump is as follows:
PWM (pulse width modulation) for controlling duty ratio of signal to be less than or equal to water pump closing duty ratio1(10％)，n＝0RPM；
Control signal PWM with duty ratio not less than water pump full-open duty ratio2(90%) maximum value of rotation speed vmax；
When the duty ratio of the control signal is 10% -90%, the rotating speed linearly and continuously changes along with the duty ratio, and the calculation formula of the water pump grabbing rotating speed is as follows:
wherein v ismaxFor maximum speed of water pump, PWMtDuty ratio, PWM, of control signal for water pump at present1Is the control signal duty ratio, PWM, when the water pump is closed2Is the control signal duty ratio when the water pump is fully opened.
Fault diagnosis of front-drive water pump (water pump 3)
And determining the fault state of the water pump according to the fault feedback duty ratio signal of the controller of the water pump 3. The method comprises the following specific steps:
1) the fault feedback duty ratio signal of the controller of the water pump 3 is equal to 10 percent, and a low-voltage fault is reported;
2) the fault feedback duty ratio signal of the controller of the water pump 3 is 20%, and the current fault is reported;
3) the fault feedback duty ratio signal of the controller of the water pump 3 is equal to 30 percent, and an idle fault is reported;
4) and (4) reporting the overvoltage fault when the fault feedback duty ratio signal of the controller of the water pump 3 is 80%.
Precursor circulating water pump enable
If the highest temperature of the precursor circulating water path part is greater than or equal to the starting threshold temperature of the precursor circulating water pump, enabling the precursor circulating water pump to be set to be 1;
and if the highest temperature of the precursor circulating water path part is less than or equal to the closing threshold temperature of the precursor circulating water pump, enabling the precursor circulating water pump to be set to be 0.
Control of front-drive circulating water pump
Condition that the operation of the front-wheel drive circulating water pump must meet
Condition 1: the whole vehicle is in an ON/START/CHARGE mode, and the water pump is enabled to be set to be 1;
or the whole vehicle is in the AfterRun mode.
Condition 2: the voltage of the low-voltage battery meets the normal working voltage of the water pump;
condition 3: the water pump has no fault.
If the conditions 1, 2 and 3 are met, the water pump 3 drives the circulating water pump 3 to control to be set to 1, otherwise, the water pump is set to 0.
Normal mode (Whole vehicle power-ON mode is ON/START/CHARGE)
When the power-ON mode of the whole vehicle is ON/START/CHARGE and the water pump 3 is controlled to be set to 1, the duty ratio 1 of the control signal of the precursor cooling water pump 3 is obtained by looking up a table according to the highest temperature of the precursor circulating water path part, and the table is shown in table 4.
Table 1 correspondence between the starting duty ratio of the precursor circulation water pump and the highest temperature of the precursor circulation water path unit
Afterrun mode (Whole vehicle power-ON mode is changed from ON/START/CHARGR to OFF/ACC)
Here, the control is the same as the control of the aforementioned back-drive circulating water pump, and the description is omitted. Only the corresponding relation between the operation time of the AfterRun water pump and the water pump starting duty ratio when entering the AfterRun is listed, and the table 5 shows.
The result in the AfterRun mode is that the precursor cooling water pump 3 controls the signal duty cycle 2.
Table 2 correspondence between operating time of precursor cycle after-run water pump and water pump on duty ratio when entering after-run
Influence of ambient temperature on cooling water pump
Table 6 shows that, in the same manner as the above-described back-drive circulating water pump control, the final target PWM signal requested by the front-drive cooling water pump 3 is output based on the compensation value of the duty value determined based on the outside temperature in addition to the calculated duty ratio 1 (or 2) of the control signal for the front-drive cooling water pump 3.
TABLE 3 Compensation of ambient temperature to control duty cycle of precursor Water Pump
Control signal frequency of front-drive circulating water pump
The control signal frequency is a fixed value (200Hz) when the water pump 3 is turned on and off.
Rotational speed of water pump 3
The correspondence between the water pump rotation speed and the target PWM signal requested by the precursor cooling water pump 3 is as follows:
PWM (pulse width modulation) for controlling duty ratio of signal to be less than or equal to water pump closing duty ratio1(10％)，n＝0RPM；
Control signal PWM with duty ratio not less than water pump full-open duty ratio2(90%) maximum value of rotation speed vmax；
When the duty ratio of the control signal is 10% -90%, the rotating speed linearly and continuously changes along with the duty ratio, and the calculation formula of the water pump grabbing rotating speed is as follows:
wherein v ismaxFor maximum speed of water pump, PWMtFor water pump at presentControl signal duty cycle, PWM1Is the control signal duty ratio, PWM, when the water pump is closed2Is the control signal duty ratio when the water pump is fully opened.
Abbreviation search table
Fig. 2 is a schematic structural diagram of a water pump control system of an electric vehicle according to an embodiment of the present invention, and for convenience of description, only parts related to the embodiment of the present invention are shown.
The system comprises:
a rear-drive water pump 1 and a rear-drive water pump 2 which are arranged on the rear-drive cooling circulation water path, the rear-drive water pump 1 and the rear-drive water pump 2 are connected with a PWM control signal pin 1 of a VCU controller,
the forerunner water pump 3 is arranged on the forerunner cooling circulation water path, and the forerunner water pump 2 is connected with a PWM control signal pin 2 of the VCU controller;
the VCU controller controls the rear-drive water pump 1, the rear-drive water pump 2 and the front-drive water pump 3 based on the electric automobile water pump control method.
The control method of the automobile water pump provided by the invention has the following beneficial technical effects:
1) the VCU controller controls the water pumps 1, the water pumps 2 perform cooling and heat dissipation for the rear-drive circulating water path system, and the water pumps 3 perform cooling and heat dissipation for the front-drive circulating water path system, so that potential safety hazards caused by faults of a certain cooling water pump are avoided; 2) the fault detection processing of each important part of the cooling circulating water path is added, so that the abnormal processing of the VCU controller caused by the transmission of abnormal signals when the sensor is in fault is avoided; 3) judging the fault type of the water pump according to the duty ratio signal fed back by each water pump controller and reasonably controlling the fault type of the water pump, and abandoning the disadvantages of the traditional look-up table; 4) according to different power supply modes, the water pump is divided into a normal mode and an AfterRun mode for control, so that the economy and the safety are greatly improved; 5) taking into account the influence of the external ambient temperature. At normal temperature (20 ℃), the duty ratio of the water pump can be adjusted according to the temperature of vehicle parts, so that the flow of cooling liquid of the cooling loop is adjusted. At high temperature (above 40 ℃), the temperature difference between the parts and the environment is small, and the heat dissipation is more difficult. A certain duty ratio needs to be added on the basis of the duty ratio corresponding to the temperature of the parts so as to enhance the heat dissipation capability. At low temperature (such as below-20 ℃), a certain duty ratio needs to be subtracted from the duty ratio corresponding to the temperature of the parts, and the rotating speed of the water pump needs to be properly reduced so as to avoid excessive cooling. The economy and the safety are greatly improved; 6) according to the duty ratio signal of the cooling water pump, a set of brand-new rotating speed calculation model is designed, the disadvantages of the traditional look-up table type are abandoned, and the processing speed of the VCU controller is greatly improved.
The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.
Claims (8)
1. The method for controlling the water pump of the electric automobile is characterized by comprising the following steps:
when the whole vehicle is in an ON/START/CHARGE mode, determining the duty ratio of a control signal of a corresponding water pump based ON the highest temperature value of a cooling part of a circulating water path;
when the whole vehicle is in the AfterRun mode, the working duration of the AfterRun mode and the duty ratio of the water pump control signal under each working duration are determined based on the duty ratio of the water pump control signal at the moment of entering the AfterRun mode.
2. The method for controlling a water pump of an electric vehicle according to claim 1, wherein when the water pump is operated in a high temperature environment, the duty ratio of the control signal for the water pump is compensated in a positive direction, that is, the duty ratio of the control signal for driving the water pump is increased, and when the water pump is operated in a low temperature environment, the duty ratio of the control signal for the water pump is compensated in a negative direction, that is, the duty ratio of the control signal for the water pump is decreased.
3. The method for controlling the water pump of the electric automobile according to claim 1, wherein the method for calculating the rotating speed of the water pump based on the duty ratio of the control signal is as follows:
wherein v ismaxFor maximum speed of water pump, PWMtDuty ratio, PWM, of control signal for water pump at present1Is the control signal duty ratio, PWM, when the water pump is closed2Is the control signal duty ratio when the water pump is fully opened.
4. The electric automobile water pump control method according to claim 1, characterized in that the water pump fault diagnosis method is as follows:
reporting a low-voltage fault when the fault feedback duty ratio signal is 10%;
the fault feedback duty ratio signal is 20%, and a current fault is reported;
reporting an idle fault when the fault feedback duty ratio signal is 30 percent;
and (5) reporting the overvoltage fault when the fault feedback duty ratio signal is 80%.
5. The method for controlling the water pump of the electric automobile according to claim 1, wherein the starting conditions of the water pump are as follows:
condition 1: the whole vehicle is in an ON/START/CHARGE mode, and the water pump is enabled to be set to be 1;
or the whole vehicle is in the AfterRun mode.
Condition 2: the voltage of the low-voltage battery meets the normal working voltage of the water pump;
condition 3: the water pump has no fault.
6. The control method of the water pump of the electric automobile according to claim 5, characterized in that when the highest temperature value of the cooling part of the circulating water path is greater than or equal to the starting threshold temperature, the enabling position of the water pump is '1';
and if the highest temperature of the circulating water path part is less than the closing threshold temperature, the enabling position of the circulating water pump is '0'.
7. The method for controlling the water pump of the electric vehicle according to claim 1, wherein when the whole vehicle is in the Afterrun mode, the method for controlling the duty ratio of the water pump control signal for each working time period in the Afterrun mode is as follows:
determining the working time of the water pump in the AfterRun mode based on the duty ratio of a water pump control signal at the beginning time of the AfterRun;
dividing the working time by the set simulation step length time to obtain the cycle calculation times;
calculating the difference value between the duty ratio of the control signal entering the AfterRun and the duty ratio of the control signal when the water pump is closed;
the quotient of the difference and the cycle calculation times is the duty ratio of the control signal which is required to reduce each simulation step length time in the AfterRun mode;
and (4) gradually subtracting the control signal vacuum ratio from the control signal duty ratio of the water pump at the beginning of the AfterRun, and circulating until the control signal duty ratio is reduced to the control signal duty ratio when the water pump is closed, so that the water pump completely stops working.
8. An electric vehicle water pump control system, the system comprising:
a rear-drive water pump 1 and a rear-drive water pump 2 which are arranged on the rear-drive cooling circulation water path, the rear-drive water pump 1 and the rear-drive water pump 2 are connected with a PWM control signal pin 1 of a VCU controller,
the forerunner water pump 3 is arranged on the forerunner cooling circulation water path, and the forerunner water pump 2 is connected with a PWM control signal pin 2 of the VCU controller;
the VCU controller controls the rear-drive water pump 1, the rear-drive water pump 2, and the front-drive water pump 3 based on the electric vehicle water pump control method described in claims 1 to 7.
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| CN114043849A (en) * | 2021-12-22 | 2022-02-15 | 宜宾凯翼汽车有限公司 | Control method for electric control element in pure electric vehicle refrigerating and heating system |
| CN114347747A (en) * | 2021-12-22 | 2022-04-15 | 宜宾凯翼汽车有限公司 | Electric automobile heat management control method |
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Application publication date: 20200922 |